🏷️ Basic Information Identification Make: BMW Model: 3 Series Model Generation: E21 Codes Chassis Code: E21 👋 Introduction Market Position Market Segment: Entry-level luxury sports sedan Competitive Analysis Key Competitors: Audi 80, Mercedes-Benz W123, Alfa Romeo Alfetta, Saab 900 Key Features Design Philosophy: Compact, sporty, driver-focused vehicle emphasizing performance and handling. Brand Heritage: Built upon BMW's legacy of producing engaging driving machines. 📋 Manual Details Coverage Areas Model Years Covered: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984 Page Count Page Count: 910 Manual Type Manual Type: Workshop Service Repair Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine Overhaul: Complete disassembly, inspection, repair, and assembly of all engine variants. Fuel System: Carburetor and fuel injection system diagnostics, repair, and adjustment. Ignition System: Spark plug, coil, distributor, and electronic ignition system servicing. Cooling System: Radiator, fan, thermostat, water pump, and coolant system maintenance and repair. Exhaust System: Catalytic converter, muffler, and exhaust manifold inspection and replacement. Transmission Manual: Manual gearbox removal, disassembly, repair, and installation, including clutch service. Transmission Automatic: Automatic transmission fluid, filter, and adjustment procedures (if applicable to specific models covered). Drivetrain: Driveshaft, CV joints, differential, and axle servicing. Suspension Front: MacPherson strut, control arms, ball joints, and sway bar service. Suspension Rear: Semi-trailing arm, shock absorber, and trailing arm bush replacement. Steering System: Steering rack, tie rods, steering column, and power steering system (if equipped) repair. Brake System Front: Disc brake caliper, rotor, pad replacement, and bleeding procedures. Brake System Rear: Drum brake shoe, wheel cylinder, and brake cable servicing. Electrical System: Wiring diagrams, fuse box layouts, battery, alternator, starter motor, and lighting system repair. Bodywork Exterior: Door panel removal, bumper repair, glass replacement, and trim piece installation. Bodywork Interior: Seat removal, dashboard disassembly, and headliner replacement procedures. Heating Ventilation And Air Conditioning: HVAC system diagnostics and repair, including blower motor and evaporator core replacement. Procedures Included Routine Maintenance: Oil changes, filter replacements, fluid checks, and lubrication points. Troubleshooting Diagnosis: Systematic diagnostic procedures for common and uncommon faults. Repair Procedures: Detailed, step-by-step instructions for component repair and replacement. Disassembly Assembly: Comprehensive guides for taking apart and reassembling all major vehicle components. Adjustments: Precise instructions for carburetor, ignition timing, valve clearance, and brake adjustments. Installation: Procedures for installing new or reconditioned parts and accessories. Special Tool Usage: Identification and usage instructions for specialized BMW service tools. Technical Depth Depth Of Coverage: Comprehensive 'bumper-to-bumper' coverage from basic maintenance to complete engine rebuilds. Diagrams Illustrations: Abundant pictorial diagrams, exploded views, drawings, and photos to clarify procedures. Torque Specifications: Detailed torque values for all critical fasteners and bolts. Wear Limits: Specific dimensional tolerances and wear limits for critical components. Service Data: Essential service data, including specifications, capacities, and fluid types. Diagnostic Information: Inclusion of diagnostic procedures and symptom-based troubleshooting guides. 📊 Manual Specifications File Format File Type: PDF Print Quality Printability: Printable pages Document Resolution: High resolution, suitable for clear printing. Binding Type Binding Type: Digital (Instant Download PDF) Paper Type Paper Type: Not Applicable (Digital) Compatibility Operating Systems: Windows, Mac, Linux OS Requirements Software Requirement: Adobe Reader ⚙️ Engine Specifications Primary Engine Engine Codes Commonly Found: M10 series (e.g., M10B18, M10B20, M10B23) Performance Horsepower Range: Approximately 90 hp to 145 hp depending on engine and market. Torque Range: Approximately 130 Nm to 205 Nm depending on engine and market. Fuel System Fuel Delivery: Carburetor (Zenith, Solex) or Bosch L-Jetronic fuel injection on later models. Engine Layout Engine Configuration: Inline-4 cylinder Engine Displacement: 1.8L (1766cc), 2.0L (1990cc), 2.3L (2316cc) 🔧 Transmission Standard Standard Transmission Type: 4-speed manual Optional Optional Transmission Type: 5-speed manual, 3-speed automatic (ZF) Features Clutch Type: Single dry plate 📐 Dimensions Exterior Wheelbase: Approx. 2570 mm (101.2 in) Length: Approx. 4360 mm (171.7 in) Width: Approx. 1610 mm (63.4 in) Height: Approx. 1380 mm (54.3 in) Weights Curb Weight Range: Approx. 1100-1250 kg (2425-2755 lbs) 🛡️ Safety Features Ratings Crash Test Era: Older vehicle; specific standardized ratings from modern agencies may not directly apply or be available. Active Features Braking System: Front ventilated discs, rear drums (standard); optional rear discs on some models. Parking Brake: Mechanical, rear wheel application. Passive Features Seatbelts: Lap and shoulder belts (front), lap belts (rear). Body Structure: Reinforced passenger safety cell, crumple zones. 💡 Technology Features Infotainment Infotainment System: Basic analog radio with cassette player option. Driver Assistance Driver Assistance Features: Limited; basic safety features like power steering (optional) and ABS were rare or not available. Connectivity Connectivity Options: None (pre-dates widespread electronic connectivity). 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 7,500 - 10,000 miles (12,000 - 16,000 km) or annually. Filter Replacement Interval: Oil filter with every oil change; air filter and fuel filter every 15,000 - 30,000 miles. Coolant Flush Interval: Every 2 years or 30,000 miles. Fluid Specifications Engine Oil Viscosity:...